At
New York Comic-Con '12, Capcom announced "Street Fighter X Tekken:
Version 2013", a free DLC update that includes major system
changes and character tweaks, set to be released in mid-December. Some of
the changes include a toned down visual effect for gems and slower health
regeneration. Here's the full
list of known changes so far:

SYSTEM CHANGES

The
visual effect while Gems are active has been changed.

Recoverable
health has more distinct color.

Normal
throws are faster, now with a 5F start-up over the 7F start-up in
previous versions.

Tekken
characters have improved anti-air techniques.

Recoverable
health regenerates at a slower rate, reducing the number of timeouts.

Cinematic
camera during Boost Combos has been changed, giving battles a more
speedy feel.